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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25d4efc0a66ca6ada006c17e2e2ed6efc7969d7fa5accf9087ab9fa9e71796ca' 
  AND token = 'HX0JiWCkbmQIuwzCFJAxqyMNuFRBP98IWsAxZeyGOU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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