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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1a0725c3689abe2c45339abfc5c7a35cffccb5d0cfd2e032f68f6f43e1f4ba8' 
  AND token = '907L7NuKVaA3c9cV1j3TrZzkMQUqNqN8SJC73JsWPBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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