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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bf4c66daa1c92b8d343ebda4f6e5255152e7ee1bc16b1b1d9cfb28fa3f8abdd' 
  AND token = 'XM9E3l/BIwup1cY6TjjhW1cXjtkiETyigFsqnzm/1Xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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