SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee0523086e8f7a1bbeb5a1758d1fac45302021699c0ceeb5fe900c745e63b84d' 
  AND token = 'JCNyZLFGA8hq6hh6dQAz1rZbXjWjUQ1mQxFpuZ8+AGk=' 
  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