SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2a02ad82c3515eb32eba6ffb326868027fcdf53fdd00cf188d5aed9e1696795' 
  AND token = 'mvQvLV+EKHt5wB5QfKuCNUe6RNq/qIf01Y3mqfocp6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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