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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ed1b032b98a3b992dc0cc43c85d7d77938f9d3ca0c5af0c9666adbd24107458' 
  AND token = 'jUxe4MUuVNMoTDl7qbkDKGw4vfoZntm6wvRUZ6C/iMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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