SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1a1c6ae87d86ee360622e2dac75afd2645275607e85ce54018b4a0604933983' 
  AND token = 'hyqsCru8j9M47YO1rK4ptTyPdx/poTRfLoA6Q9lkp6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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