SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3980e08ef068240890f6fed18e5be81bc704293a94bb1c6b1356f6bbb66000ca' 
  AND token = 'a5BeE89OMFBIma+X741FzS0JUzTIPSomi9YBI6z3gz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

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