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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd705dba9f4c4d8e009f01802bd6d8cfe596571b85f1e7a94d4d53b885b9dd50' 
  AND token = 'TJgAnEvpAdmcxoVdw+yBcDiQcGg1AB48bPgh9EKPydw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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