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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbe7bb428864ee4b74e9bd6d88fb28a5a0808102b97a2f0e7e6ded5bf587f8ac' 
  AND token = '+kiAKJomEK0bLKylKN8hEcOQyfUm7WuxTBEWmiyrxgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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