SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '955b51419916827127aad468edcfefc26cc4076ecc51eb6ec31aaaf53abc6aec' 
  AND token = 'N+2xaTU8z/rPqMEgl/9En9tDBIoiyh1CrRwWWRWQV3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

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