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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47d41435e6ff16ac9a29ca691b35ceac2a8ecf32e64727a29e1229e2651d4e6f' 
  AND token = '6O3DzDnIZkRm3CTQ0ZVNPaTh369cMPnEqCLtpciIS3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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