SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a353baea65e7217d0e04c39e55174fafa06ec497a4e1fced3a6edd7b2a031f8' 
  AND token = 'o0vrCJucYhdBqfGTRfCAPr/KFga93umpnVczNyGZ5kw=' 
  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