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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd7c3484e77f72e4e4e8c63a93e15142b51b6b45c3398dab7fb32174753e867f' 
  AND token = 'vlxpU7J4e5HysD5SldMoNRLWPw00EGoWjs9lJPrUzy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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