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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e6c514ae831b68b90719a53b7714dbe7a209187aa80f42ab344801b13de0c19' 
  AND token = 'i20FxMf8NXMTpkYow0lEZ9JVDaio+Tf1rKiiH4WZNpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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