SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '266a420633d0d6b512e4196f907b32bc835da7ff506a75cd686ad5c1cc71f02d' 
  AND token = 'v4GEsZjc6Jl1WkcAjEzC/6mgamS80/8+4aKsdy8ttqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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