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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '794edd80490581cd911a4b0d4d871c21f79459ed6fb11f80d6310b129f9bcdff' 
  AND token = 'WABw0pe6/cKoWloP5FZS4SHKJ7NnanQhXdJYTzLY4Ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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