SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '445c862a4df1a3151489395509782c5078091a80c973b78ce87e82ef7a4f4da5' 
  AND token = 'dJ1xzqVpkSaCPDN/isBIphALQBlWWHdemrFn8Yrg3xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

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