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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e57f09bd3b54981bae471b737d65671b992ff92b9ff104000008a8cb1b51ece4' 
  AND token = 'Hj7D33MzsIfDXIjElKUd2ZkmVE1CdiFScp6re6+mnlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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