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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4eed3919359b883ddf51453e3671c2ce7d8d9c96438f97a6b6a4cc587b02ac8f' 
  AND token = 'y999h/kbXrpLiQVTrQJ0K2fJ0ntbTTB2+6ARDR+DiBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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