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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04a714bbb4d41a04d0824502cf1409e9f1749734e0062397b8aaeee53da6ef98' 
  AND token = '+nxVbF77AEyw0zpOSyFyTHS3RcMYZxYhemH469w46Uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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