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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef9c69cf1972cef0ab73575395ced379b157f94c076b97d1303a26d19865abbb' 
  AND token = 'RwryBNytIAP52jFroopf2eMVgW7ZWZKsZXbBL9uhBoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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