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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b49ed2d3c73d5f01c843a7080530bfda92c3f38b789c3b798975e89a84e6f57' 
  AND token = 'kdt/C5HDwAp7sYUOefNr2bnbi6JrSr4l+XsW3WCATe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}