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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c48d340303bdef43f1c3bb3c25a877d8c8b670f083d0acd51673a9164d0096fa' 
  AND token = 'lmVfcOEgxEfTQ4Mn9jPf6xyzXvdtV0rIHVEKSCMfUBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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