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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d89d8228fc338f305d54dd1deb33a7ad812f22b487415cb63766c4915c603ab' 
  AND token = 'bvZx1/oY1MXc5Zxj8QZQnOGZu/IiQrEEONckvNwT3F4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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