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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee554120bcb0a5fd9967926eec66cbb4f21ec34bd68e1b0ec01ebd8bcf1cfcac' 
  AND token = 'TSfdVWeqT5QR9oAHe/Pal4tThf6LZHPix4jcMMdHUek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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