SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b854732bb3374bcce0b77a7dbb12c2a5ed5783cc55a76129c8708327ccb37376' 
  AND token = 'Czq3BNJXB/yhTjNn/p1owZRokeIAe0w5HQjuqHfa5lI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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