SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '000a88afcfa6983ddeabcbaf3d6215e526d27b8905156e0eb2640c9954689c28' 
  AND token = 'sMf5A3oS8JF0Foycwp/WzRPW4WwGPR/XOHKM0CKsVQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

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