SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57899b2bb12c028cf9405ac970daa2ee54a5d7e49c197c2ed02770cfa5ab4ad7' 
  AND token = 'dr/TSt4o53/h+XG/dkNUjpep2cIce7UFQPD0HDvBy/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

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