SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c9f4e177bcb925ccd8c46f67cda92f309a13a1bb1df1e3337459a48e8802741' 
  AND token = 'RznuGGGpOW7Zu5B2AuaCyLC8AZytPXH+xUcDjQYDabk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

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