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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4774142ec3b1171e5b939f6d43d0ae3e150d6727ab37f760095b9cee43bfc2d' 
  AND token = 'Qdk5bCDTRhw/G6E4HqHCi2hz/WpDN0GkTj3FFgtPN6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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