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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f39f754c52608c0b99d85b748495c6aa57519416d6c3d2c2d2626ffb12cca3bc' 
  AND token = 'Q6EYm0UsH36E2tzD2dq/cHrGT7KFQIDxAGeQntITUFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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