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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3234d1b4595eba2ee79089fa2d7d085436e6108f0f0f3592593546ff0c6db4b6' 
  AND token = '4aXi77fj3Fh4AYUrass8bDEY8kfVSO5QU+IW/KhjbiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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