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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf64e8a6d521049c54273238234df9bcacca69e4adb9032dd89f4d4943c4e55b' 
  AND token = 'ZxNGMNsuIGjtpjvASAl+uMgNYX7Zn47EnVd5Sz55zrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}