SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5e4c81d0bec460ff2486649222dc046385728e5cf3458887807ecec9cc58533' 
  AND token = 'AHLge1Ah5+gDhnmalZUVCrCPyp6FG1rdep79iu3HMCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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