SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cc44be75bf2e27b37e8c5a863017cdfe476fa62a7527a2d3dcb62f7f2809b26' 
  AND token = 'bkOQnKjPTCU8Z6bFNmEVMze89reI368p1+eUU1pzXZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

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