SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd163d3976bb303332814081fef36f81ee1c153a71afa33fe45fae5f79b10b38d' 
  AND token = 'uFL1rOxEOmw64XJ42WB0bSvz5oaq8BQhzN4U7K/HINs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

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