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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83bb597efdaee6511be9ccfea1b7730408b21413bedd6b11eabdc7277be4d8c4' 
  AND token = 'zcbG4O3lFtOvU9Y6jXqqxOTOiwfqrAi1vn6AqEG+0wU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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