SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a714009fb6e3fc857e8da6e08ebfc46e52dc32ce5a0b3355083f5aa3d5e7d6b7' 
  AND token = 'VcoD5rRa7SteW0gEyHmcoCQSrs57mtIm+pXbnnyn30Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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