SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cf0009d782674e71621770e8eba58efb8a9e484ebd295baf885d22d1594cee6' 
  AND token = 'LNgSP4ZXCa1zzm4Pwn/lkKZRd6rO5rIE/YSiABX89i4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables