SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f7dcb52c99970184fcd8f128083a383aa52e83806fd2c3611f3eeb7702b0f9d' 
  AND token = '94dAbPMD7E4oS37+5odnUI+m4Y1BMJnqc4zWh7ajW5o=' 
  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