SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc62136ccde7fbc08fa273ec9db765156bbead901692292fe7a9e796cf2dfb10' 
  AND token = 'VY7PggGK6+4p2d3MrmcAzjheIyV1XkRj20fiSsTmaAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

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