SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c3cecbb9f60bbe51d88c716b9b2dcb3eac97f6fcd205b6afa9f464a3e021bd7' 
  AND token = 'XVg6lCvxcYSa9OHGHJwSRJEeo+8rQ81gmQP3Ro3b2H4=' 
  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