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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbf0b62a56e4886fa3deca4db19d5bb94791fa1d06a429ab81dec96974b6f9a8' 
  AND token = 'wQ29ZZ+eOqqckS2AhfnfOgxWMa/JekvQOJJmrk7kCjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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