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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '141811b63d9f7fccc9ac1e5c3554fdb52d4f7604da3f964ae424f4542a274c66' 
  AND token = 'X87HHCakjYkH6qYRhLDj5JwyFtZ6maKn7l6sR7SfUDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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