SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c95bfb3d707a4575efc34f0a641ca4cb1c5816ca37634760c8852ef11afdb2a0' 
  AND token = 'pMCH5xOB3+w1+ZY+RcKj6VKwJ3InCc2dPo7Em04z2rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

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