SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd72d4e7f3bd9c1713c5a0a4b4dc7e80c6f30ad2f5be7bc2a6903aea844f99ba9' 
  AND token = 'lQ3r1LFUKnkNXs+5jpyYsEZckLSofjm5AxzhwN0Uer0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

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