SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df0144545e90bf168471a7cb20147ea935e293a2cb72452ca14df0810a1b10f9' 
  AND token = 'GnNaMF3hJp+1i2w9sO03x4pDaxfqStwqmwI8dDse1aw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

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