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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '198a0e974a01fe8ea20a7efa84502eaa76e9d62be60ce3db16811eae77e17874' 
  AND token = 'PuTVeK3q/yJzBNciHAZkvJP7LMEyxL5qYVLNhDg1ExU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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