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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5bd2ac399e1da40fe74eb3b5a83995f1eb13b9240293adcb7ec5bd4da95a687' 
  AND token = 'SkxJPfMKuCnCw8dBGblalhnCo5LK9QZ5LMrWXcO+c/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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