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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6acb08549ddd60df2d057403b923cac86e105c2f590ca1592c1d017acf8cb95' 
  AND token = 'jcGh2qBNBe8+13HdJoGKLGsSj2Sep0g/XF6mktPFjsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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