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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0194651154e53a3d270bd1ac20b43fb1bef9ce22e9dd51f76583b9adb6b0c85' 
  AND token = 'h147JfeM//5rXpgKZs2u8VdfKDz89aQKj1rNzZIi8Ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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