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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6410539200d891e1f3ba8ffe21248a3652f1ad831da9dd6495f9eeb89ba62f9c' 
  AND token = 'x1++cXxPxN6G8Kah7Jm4imkLwOOshqv0+jlLcvP08AQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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