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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b7ff3c1d3479b8031a84b377dad4fde435d61fe84ec918cc9b8cef74e4f8eeb' 
  AND token = 'AYIXm/b8F+f2hcuPhQ2wIL+HEeWdK1HOPrRFbRrD7hU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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