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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ac6f7489453f9cd67e5f1c5d4ab9eaadf384f8ed77da3ba74ed6a32f5a20589' 
  AND token = '41L1oZLfVnsQvdXdhXuNVftt9swwRUElnHHnu/p14h4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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