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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34d282fbeef606254a074eaff198ad6dd70b5de86f69e28e3769040a8a6e03ca' 
  AND token = 'yxc0MY6axUh5pSF72/Q+Nj2B7qjjNP/nMt0xcRll/SM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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