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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07f6a90d701ed8a823980ccd6c522083fccbeac09181f3d74b27af6039663d86' 
  AND token = '1v9fbSUGrwmt6QoM54fglYAtRPrWLiDHQtx5Nij8ZA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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