SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '616e29436aa02f2fef52ac88914fdce9f1c1fbc1c18bac0f27b1a2b9c4ba7fe2' 
  AND token = 'CYAL9UMuKfM97Xobz7EuNhO8+caisSdh8Tzmftk2+mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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