SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42065da87f086f162868546391b2fa8147a51e5b5473dff26999f18beca0bb0d' 
  AND token = 'WlIPhjUYhP2RN2kBigK/UOD6eSDwqRhjf+VV/UuD3Po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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