SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f123d41b7a6e98c959f128577d48fed7a82f38707fb1dd4ef574409a054c2eb' 
  AND token = 'F89pTQSlmM0FQKADrg8Q2tvqGzkapYuQinb0w/accH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

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