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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bf1501b455306ab6977665213111a98d3bb96d9c4d15e763b8b67841098396a' 
  AND token = 'vGZDz9BY4qaBY+QU9mmwOCxsOsiVcPe671GtatNZI+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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