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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbbf6783a4b19bfa5537d8898720621a5f382bc6bc7c534eff0ca11d41f7c122' 
  AND token = 'xgvH77Q8dyt5G9r2VGVOdnHbkOdZsXvKeULB3bB5ae0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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