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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0033ba27635382e030994e62fef991d22e27e82d6e424b4237a7d2e37887858b' 
  AND token = 'ff+hOvebuxIULEc1TffBojvVHVoIVybV8OJUqliC2Lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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