SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2d485d4fc19c8983c9019c75ce549246b0af7e5cd16b3d2e826ec905b1ef3a0' 
  AND token = 'XSARZkK/sQp+yzN3lWBUsM7H1ff4+FCbOoIwtSW04mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

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