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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd67d7b64c8d6c45448343a87edeb0777d68052bd634ce3cc7b1f8bba966bda47' 
  AND token = '20m2jwhXaoW0kotpcLrPhXPzxBIv4p8neb6lPBFvgpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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